Estimation of the Mortalities of the Immature Stages and Adults

Service, M. W.

doi:10.1007/978-94-015-8113-4_10

Cited by 4 publications

(3 citation statements)

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“…Main techniques dealing with business are either classical and simplistic (Davidson, 1954;Detinova, 1963) or more sophisticated (Ndiaye et al, 2006), deriving from the parous rate and mark-release-recapture techniques (Service, 1993). Survival rate can be estimated from the parous rate only with a population showing a relative stable age distribution (Service, 1993), which is not the case of the explosive population dynamics of Ae. Caspius; mark-recapture methods are quite demanding as they require the release of a large number of marked adults due to the relatively low recapture rates (Service, 1993).…”

Section: Discussionmentioning

confidence: 99%

“…Survival rate can be estimated from the parous rate only with a population showing a relative stable age distribution (Service, 1993), which is not the case of the explosive population dynamics of Ae. Caspius; mark-recapture methods are quite demanding as they require the release of a large number of marked adults due to the relatively low recapture rates (Service, 1993). Our approach allows assessing the depletion rate from a CO 2 trapping survey, which is by far considerably easier to implement than mark-recapture methods.…”

Section: Discussionmentioning

confidence: 99%

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Mosquito density forecast from flooding: population dynamics model forAedes caspius(Pallas)

Balenghien

Carron²,

Sinègre³

et al. 2010

Bull. Entomol. Res.

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Insect population dynamics depend strongly on environmental factors. For floodwater mosquitoes, meteorological conditions are crucial in the rhythm of mosquito abundances. Indeed, rainfall triggers the egg hatching after flooding breeding sites, and temperature controls the duration of the aquatic immature development up to adult emergence. According to this, we have developed a simple mechanistic and tractable model that describes the population dynamics of floodwater mosquitoes as a function only of the most accessible meteorological variables, rainfall and temperature. The model involves three parameters: development duration tdev of the immature aquatic stages, the adult emergence rate function f(t) (characterized by the emergence time scale tau and shaping the profile of adult population abundance), and the depletion rate, alpha, of adult disappearance. The developed model was subsequently applied to fit experimental field data of the dynamics of Aedes caspius (Pallas), the main pest mosquito in southern France. First, it was found that the emergence rate function of adult mosquitoes very well reproduce experimental data of the dynamics of immature development for all sampled temperatures. The estimated values of tdev and tau both exhibit Arrhenius behaviour as a function of temperature. Second, using the meteorological records of rainfall and temperature as inputs, the model correctly fit data from a two-site CO2 trapping survey conducted in 2004 and 2005. The estimated depletion rates (summation of the mortality and the emigration rates) were found to be a concave quadratic function of temperature with a maximum of 0.5 per days at about 22 degrees C.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Mosquito density forecast from flooding: population dynamics model forAedes caspius(Pallas)

Balenghien

Carron²,

Sinègre³

et al. 2010

Bull. Entomol. Res.

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“…More modern tools for determining mosquito age include chemometrics, 7,[17][18][19][20][21] transcriptional and protein profiling, [22][23][24][25] biochemical analyses, 26,27 and alternative physiology-based morphological assessments. [28][29][30] These methods present their own technical and cost-benefit challenges and all have biases in being able to accurately measure chronological age, especially from wild-type adults. 31 An ideal mosquito age grading tool should be viable with both laboratory colonies and in field settings using wild-type adults, be neither technically difficult nor too labor intensive, and allow for rapid processing of many specimens per sampling time point.…”

Section: Introductionmentioning

confidence: 99%

Back to the Future: Quantifying Wing Wear as a Method to Measure Mosquito Age

Gray

Asay²,

Hephaestus³

et al. 2022

The American Journal of Tropical Medicine and Hygiene

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ABSTRACT. Vector biologists have long sought the ability to accurately quantify the age of wild mosquito populations, a metric used to measure vector control efficiency. This has proven challenging due to the difficulties of working in the field and the biological complexities of wild mosquitoes. Ideal age grading techniques must overcome both challenges while also providing epidemiologically relevant age measurements. Given these requirements, the Detinova parity technique, which estimates age from the mosquito ovary and tracheole skein morphology, has been most often used for mosquito age grading despite significant limitations, including being based solely on the physiology of ovarian development. Here, we have developed a modernized version of the original mosquito aging method that evaluated wing wear, expanding it to estimate mosquito chronological age from wing scale loss. We conducted laboratory experiments using adult Anopheles gambiae held in insectary cages or mesocosms, the latter of which also featured ivermectin bloodmeal treatments to change the population age structure. Mosquitoes were age graded by parity assessments and both human- and computational-based wing evaluations. Although the Detinova technique was not able to detect differences in age population structure between treated and control mesocosms, significant differences were apparent using the wing scale technique. Analysis of wing images using averaged left- and right-wing pixel intensity scores predicted mosquito age at high accuracy (overall test accuracy: 83.4%, average training accuracy: 89.7%). This suggests that this technique could be an accurate and practical tool for mosquito age grading though further evaluation in wild mosquito populations is required.

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Survivorship characteristics of the mosquito Aedes caspius adults from southern France under laboratory conditions

Carron

Bichaud

Platz

et al. 2008

Medical Vet Entomology

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The survivorship characteristics of two populations of Aedes caspius (Pallas) (Diptera: Culicidae) were compared in the laboratory. One population was sourced from Mourgues, where larvicides have been used continuously for approximately 40 years, and the other from Pont de Gau, where there has been no consistent mosquito control. The aims of the study were to ascertain the basic life history profiles of adults and to determine whether continuous larviciding affects inherent adult survivorship. Life tables were constructed to calculate the following life expectancy parameters: mean lifetime (tau(ad)); maximum lifetime (tau(max)), and daily survival rate (p(ad)). All three parameters were higher for females than for males (paired t-test, P < or = 0.001); male mean lifetime, maximum lifetime and daily survival rate were 4.95 +/- 0.94 days, 20.50 +/- 6.66 days and 0.79 +/- 0.05, respectively; female values were 14.74 +/- 3.68 days, 49.69 +/- 16.55 days and 0.93 +/- 0.02, respectively. No differences were found between the two populations, and no correlations were found between initial adult densities and their respective survival rates. The survivorship curves for Ae. caspius were type IV for males (mortality rates higher for young adults) and type III for females (mortality rates constant).

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Estimation of the Mortalities of the Immature Stages and Adults

Cited by 4 publications

References 322 publications

Mosquito density forecast from flooding: population dynamics model forAedes caspius(Pallas)

Mosquito density forecast from flooding: population dynamics model forAedes caspius(Pallas)

Back to the Future: Quantifying Wing Wear as a Method to Measure Mosquito Age

Survivorship characteristics of the mosquito Aedes caspius adults from southern France under laboratory conditions

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